Throne of Glass Series by Sarah J. Maas

The Throne of Glass series by Sarah J. Maas is a high-fantasy epic that follows the transformative journey of Celaena Sardothien, an infamous teenage assassin. After a brutal year in the salt mines of Endovier, she is offered a chance at freedom by competing in a deadly tournament to become the Champion for the tyrannical King of Adarlan.

As the series progresses, the scope expands from court politics and lethal trials into a massive war against ancient, demonic forces known as the Valg. Celaena eventually embraces her true identity as Aelin Ashryver Galathynius, the lost Queen of Terrasen, and works to unite diverse allies—including Fae warriors, witches, and rebels—to reclaim her throne and restore magic to the world. Spanning eight books, the saga is celebrated for its intricate world-building, high-stakes romance, and themes of healing and sacrifice.